package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import com.itheima.reggie.entity.Employee;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")
@Slf4j
@ServletComponentScan
/**
 * 检查用户是否完成登录
 */
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    private static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse ;
        //1:获取本次请求的url
        String requestURI = request.getRequestURI();
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/favicon.ico"
        };
        log.info("拦截的路径{}"+requestURI);
        //2：判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        //3：如果不需要处理，则直接放行
        if (check){
            log.info("本次请求{}不需要处理"+requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //4-1：判断登录状态，如果已经登录，则直接放行
       if(request.getSession().getAttribute("employee")!=null){
           log.info("用户已登录，用户id为"+request.getSession().getAttribute("employee"));
           Long id = Thread.currentThread().getId();
           log.info("线程id={}",id);
          Long empId = (Long)request.getSession().getAttribute("employee");
          //把empId存入到threaLocal中去
           BaseContext.setCurrentId(empId);
           filterChain.doFilter(request,response);
           return;
       }
       log.info("用户未登录");
        //4-2：判断移动端登录状态，如果已经登录，则直接放行
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，用户id为"+request.getSession().getAttribute("user"));
            Long id = Thread.currentThread().getId();
            log.info("线程id={}",id);
            Long userId = (Long)request.getSession().getAttribute("user");
            //把USERId存入到threaLocal中去
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }
        //5：如果未登录则返回登录结果  (字符输入流 给前端 前端有个拦截器  响应过去就行了)
         response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

       return;
    }
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                //直接放行
                return true;
                }
            }
        return false;
        }
    }
